• 1. 怎样简便就怎样计算。

  ①6.3+5.18+5.82+2.7

  ②8.36+(8.7-2.36)

  ③7.35-(5.2-2.65)

  ④23.74-19.3-2.7

  ⑤2.96+(5.18+2.04)

  ⑥6.54-2.37+2.46-3.63